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Properties   Electrical conductivity* 0.197 106 cm-1 Ohm-1 Density* 22.65 g/cc Hardness (Brinell value)* 1670 MN m-2 Melting point* 2443ºC Rarity* 3x10-6 ppm in lithosphere Chemical element of Group VIII (Mendeleev) Atomic number 77 Atomic weight 192.22 Chemical structure   Electrical resistivity 4.71 microhm.cm at 0°C Thermal conductivity 148 watts/metre/°C Tensile strength 112 (annealed condition kg/mm2)

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